OrderByComparator.java |
1 /** 2 * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved. 3 * 4 * 5 * 6 * 7 * The contents of this file are subject to the terms of the Liferay Enterprise 8 * Subscription License ("License"). You may not use this file except in 9 * compliance with the License. You can obtain a copy of the License by 10 * contacting Liferay, Inc. See the License for the specific language governing 11 * permissions and limitations under the License, including but not limited to 12 * distribution rights of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 * SOFTWARE. 21 */ 22 23 package com.liferay.portal.kernel.util; 24 25 import java.io.Serializable; 26 27 import java.util.Comparator; 28 29 /** 30 * <a href="OrderByComparator.java.html"><b><i>View Source</i></b></a> 31 * 32 * @author Brian Wing Shun Chan 33 */ 34 public abstract class OrderByComparator implements Comparator, Serializable { 35 36 public abstract int compare(Object obj1, Object obj2); 37 38 public String getOrderBy() { 39 return null; 40 } 41 42 public String[] getOrderByFields() { 43 String orderBy = getOrderBy(); 44 45 if (orderBy == null) { 46 return null; 47 } 48 49 String[] parts = StringUtil.split(orderBy); 50 51 String[] fields = new String[parts.length]; 52 53 for (int i = 0; i < parts.length; i++) { 54 String part = parts[i]; 55 56 int x = part.indexOf(StringPool.PERIOD); 57 int y = part.indexOf(StringPool.SPACE, x); 58 59 if (y == -1) { 60 y = part.length(); 61 } 62 63 fields[i] = part.substring(x + 1, y); 64 } 65 66 return fields; 67 } 68 69 public boolean isAscending() { 70 String orderBy = getOrderBy(); 71 72 if ((orderBy == null) || orderBy.toUpperCase().endsWith(" DESC")) { 73 return false; 74 } 75 else { 76 return true; 77 } 78 } 79 80 public String toString() { 81 return getOrderBy(); 82 } 83 84 }